The information contained in this document is subject to change without notice. BERMAD shall not be liable for any errors contained herein.
All Rights Reserved. © Copyright by BERMAD Control Valves.
IOM
Model: FP 430- Sizes: 2"-6"
PI4PE09-430-UF
5. Operation
The Pressure-Relief Pilot Valve (3) senses inlet pressure and modulates the upper control chamber causing the main
valve to throttle, thus sustaining constant inlet pressure. When the inlet pressure raises above the pilot setting, the pilot
opens, pressure in the upper control-chamber decreases, and the main valve modulates open to relieve inlet pressure
and sustain pilot setting.
The pressure-relief pilot is equipped with an adjusting screw (5) to preset the desired inlet pressure and an internal
adjustable Needle Valve (2) to control the main valve closing speed.
.
Starting –up
5.1 Provide pump shut-off pressure to the Model FP 430UF Control Valve (1) inlet, allow no system
demand.
5.2 Create sufficient pressure (higher than the valve set pressure) to allow flow through the relief valve.
5.3 While relief valve is operating, wait for the valve inlet pressure to stabilize.
The pressure on the inlet side of the relief valve should be according to the factory pre-set adjusted
pressure.
5.4 Slowly allow system flow so that system pressure falls below the relief-valve adjusted pressure.
The relief-valve should slowly shut to drip-tight.
Readjusting
Tools required:
•Flat head screwdriver
•Adjustable wrench (6-10 inch)
The pilot valve is factory pre-set. The pre-set is clearly indicated on the pilot valve data-plate.
If readjustment to either the pressure or valve response is required, follow the following steps.
5.5 Ensure that there is nominal flow through the relief-valve.
5.6 Release the tension between the adjusting screw on the pressure-relief pilot valve and the fastening
nut by turning the fastening nut counterclockwise.
5.7 By alternately turning the adjusting screw (5) on the pilot valve (3) a half turn and then reading the
outlet pressure, gradually adjust the pressure:
5.8 Counterclockwise to decrease (—) the inlet pressure
or
5.9 Clockwise to increase (+) the inlet pressure.
Note: Valve response adjustment affects pre-set pressure. Any adjustment to valve
response requires rechecking pre-set pressure. See section 5.1, steps 1-4.
5.10 Repeat the Starting-up procedure, section 0 steps 1-4.
5.11 By turning the needle valve screw (2) on the pilot valve bottom, adjust the valve response. Turn:
5.12 Clockwise (while facing the screw) to decrease (-) the closing speed of the main valve
or
5.13 Counterclockwise to increase (+) the closing speed of the main valve.
5.14 Repeat the Starting-up procedure, steps 1-4.
